I'm guilty of using CPL's to the point where you lose the great reflected light. Oddly, most people have to screw up a great shot, before they really understand what they are doing. For me, I shot a stream at sunset and dialed in "my normal" maximum CPL, to get the "saturated wet look", but took a second shot of the same scene without the CPL as a test. It wasn't until I viewed them in post that I realized what I had done.